Grade 1210 grade science
Explain the formation of scum when hard water is treated with soap.
Explain the formation of scum when hard water is treated with soap.
2 Answers
Harshit Singh
Dear Student
Hard water contains salts of calcium and magnesium. When soap molecule comes in contact with these salts it forms a curdy white precipitate (compound insoluble in water) called scum. Soap + Hard water → scum
Thanks
Hard water contains salts of calcium and magnesium. When soap molecule comes in contact with these salts it forms a curdy white precipitate (compound insoluble in water) called scum. Soap + Hard water → scum
Thanks
KAPADIA DEV
Dear student...
Generally soaps are sodium or potassium salts of higher order fatty acids.
Hardness of the water determined because of presence of Ca+2 and Mg+2 ions ..they are presented as their respective salts form.
Here soap first reacts with Calcium and Magnesium salts of fatty acids which are present as off-white layer over water.Thsi is called as a “Scum”
Reactions are as below , Please go through it..
Ca+2 + 2RCOONa --------> (RCOO)2 +2Na+ (For Ca Salt )
Mg+2 + 2RCOONa --------> (RCOO)2 +2Na+ (For Mg Salt )
In this way scum is formated over hard water...This can be tested to detect whether water is hard or soft..
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